Even Rickie Fowler is doing it again after US Ryder Cup captain Tom Watson nominated the entire United States team.

Sergio Garcia did the challenge and he even used two buckets.

Ernie Els then got in on the action and nominated Queenslander Adam Scott.

When Rory McIlroy and Tiger Woods appeared on the The Tonight Show Starring Jimmy Fallon earlier this week, the pair also launched Nike’s new line of Vapor irons at Liberty National Golf Course in New Jersey.

To underscore Rory and Tiger’s night of brewing bromance, they were later filmed completing the Ice Bucket Challenge together, reigniting the trend.

Rory struggled to lift the bucket over Tiger’s head; instead pouring most of his ice into the bucket that Woods then emphatically saturated McIlroy with.

In regular Ice Bucket Challenge etiquette, Woods nominated more to take up the challenge, one being Nike co-founder and chairman, Phil Knight.

McIlroy selected former US president George W. Bush, Suits star Meghan Markle and Manchester United captain Wayne Rooney, who is also sponsored by Nike.

George “Dubya” was swift in taking up McIlroy’s challenge. Bush, Jr. obliged under the pressure of multiple nominations, including one from his daughter, Jenna Bush Hager.

In his Ice Bucket Challenge video, Dubya’s acting has left a lot to be desired as he claimed to be too “presidential” for the challenge. In a not-so-sneaky- move, wife Laura dumped the bucket of ice over her husband’s head as he pretended to write a cheque for the camera.

Meghan Markle, one of the stars of US law firm drama Suits, also accepted McIlroy’s challenge. Markle told the camera that she would only do it on two conditions: the first that she must be allowed to remind everyone what all this bucket, ice and shrieking nonsense is actually about – raising money and awareness for ALS, a progressive neurodegenerative disease.

Sadly, one of the creators of the Ice Bucket Challenge, Corey Griffin, died last week only hours after attending a fundraiser for the disease.

But, back to the importance of celebrities drenching themselves, Markle’s second request was that nominator McIlroy had to be the one who emptied the ice over her head.

In a wise move, the diminutive Northern Irishman made sure there was no repeat of his feeble effort with Tiger when he used a stepladder to get high enough to soak Markle with the freezing water.

Wayne Rooney is yet to take-up McIlroy’s challenge, but he did help his wife Colleen complete her nomination from footballer Shaun Wright-Phillips. Rooney also went one step further by dropping the bucket on his wife’s head, possibly creating a new trend of Empty Bucket Challenges.

There is no word yet whether Phil Knight has taken up Woods’ nomination. Stay tuned and stay warm.